de.anhquan.config4j.ConfigFactory.java Source code

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Here is the source code for de.anhquan.config4j.ConfigFactory.java

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/**
 * Copyright 2009 http://anhquan.de
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package de.anhquan.config4j;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.util.Map;

import org.apache.commons.collections.map.HashedMap;

import de.anhquan.config4j.internal.ConfigHandler;

@SuppressWarnings("unchecked")
public class ConfigFactory {

    private static Map<Class<? extends Config>, Config> instances = new HashedMap();

    public static <T extends Config> T getConfig(Class<T> configType) {
        T configInst = (T) instances.get(configType);
        if (configInst != null) {
            return configInst;
        }

        ClassLoader classLoader = configType.getClassLoader();
        Class[] classes = { configType };
        InvocationHandler handler = new ConfigHandler(configType);
        Object proxy = Proxy.newProxyInstance(classLoader, classes, handler);
        configInst = configType.cast(proxy);
        instances.put(configType, configInst);

        return configInst;
    }

}